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Construction method for protecting partition wall in double-arch tunnel through temporary support of middle pilot tunnel

A technology of temporary support and construction method, which is applied in tunnels, tunnel linings, earthwork drilling and mining, etc., to achieve the effect of saving materials and reducing costs

Active Publication Date: 2014-04-09
CHINA MCC17 GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the shortcomings of the above-mentioned I-beam, square timber temporary support or backfill concrete, and eliminate the problems caused by the above two measures against the horizontal unbalanced thrust of the middle partition wall, the present invention provides a temporary support protection company using a middle pilot hole. Construction Method of Partition Wall in Arch Tunnel

Method used

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Experimental program
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Effect test

Embodiment Construction

[0017] A construction method for protecting the middle partition wall of a multi-arch tunnel by using the temporary support of the middle pilot tunnel of the present invention will be further described below in conjunction with the embodiment.

[0018] The process and steps adopted by a construction method of the present invention that utilizes the temporary support of the pilot tunnel to protect the middle partition wall of the multi-arch tunnel are:

[0019] The first step: Excavate the pilot tunnel, and construct the temporary support for the pilot tunnel according to the design requirements. The support form adopts bolts, hanging steel mesh, sprayed concrete and I14 I-shaped steel arch joint support. The length is 2.5-3.5m, and the radial spacing is 1.5-2.5m; the steel mesh uses Φ8 steel mesh, the mesh size is 20×20cm; the shotcrete is marked C20, and the thickness is 20cm; I-beams, with a spacing of 1.00m / trunk, I14-type I-beams for V-grade surrounding rock, with a spaci...

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Abstract

The invention discloses a construction method for protecting a partition wall in a double-arch tunnel through a temporary support of a middle pilot tunnel, which utilizes the half temporary support which is dismantled from the middle pilot tunnel, so that the rigid connection of reinforced concrete is formed by the half temporary support, a primary lining support of a prior main tunnel and a concreted partition wall top, so the purpose of transferring the horizontal unbalanced force which is born by the partition wall to the temporary support of the middle pilot tunnel is realized. The construction method can realize the purpose of effectively resisting the horizontal unbalanced force which is born by the partition wall during the tunnel construction process; and the rear half temporary support of the middle pilot tunnel is effectively utilized before being dismantled, so materials are saved, and the cost is lowered.

Description

technical field [0001] The invention belongs to the technical field of construction of multi-arch tunnels, in particular relates to measures for ensuring the construction quality of partition walls in the construction of multi-arch tunnels, and is applicable to the construction of partition walls in all multi-arch tunnels. Background technique [0002] At present, multi-arch tunnels are widely used in my country's highways, railways, municipal infrastructure and other infrastructure. The multi-arch tunnel is a relatively new and special structure tunnel form, which has the characteristics of being less restricted by terrain conditions, saving land, good structural integrity and low comprehensive cost. It is one of the ideal choices for tunnel construction in China at present. [0003] In the construction of multi-arch tunnels, the three-pilot method is often used, that is, the middle pilot tunnel is excavated first, and then the middle partition wall is constructed, and then...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D11/18E21D21/00
Inventor 谢兰敏金玲玲
Owner CHINA MCC17 GRP